Origin of Spin Stripes in Bilayer Nickelate La$_3$Ni$_2$O$_7$
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914595453534208 |
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| author | Wang, Hao-Xin Oh, Hanbit Helbig, Tobias Wang, Bai Yang Li, Jiarui Yu, Yijun Hwang, Harold Y. Jiang, Hong-Chen Wu, Yi-Ming Raghu, S. |
| author_facet | Wang, Hao-Xin Oh, Hanbit Helbig, Tobias Wang, Bai Yang Li, Jiarui Yu, Yijun Hwang, Harold Y. Jiang, Hong-Chen Wu, Yi-Ming Raghu, S. |
| contents | The bilayer nickelate La$_3$Ni$_2$O$_7$ has recently emerged as a high-temperature superconductor with unusual spin stripe order in its ambient pressure phase. We propose a microscopic Hamiltonian that faithfully reflects the crystalline symmetry of this system, with the primary aim of addressing its unconventional magnetism at ambient pressure. Using state-of-the-art density matrix renormalization group calculations, we show that $(π/2,π/2)$ spin stripe order arises in our model at sizable Hund's coupling $J_H$ from a hidden quasi-one-dimensionality and persists over a range of electron concentrations. In the more symmetric high-pressure regime, our model exhibits enhanced interlayer pairing tendencies when the interlayer antiferromagnetic coupling $J_{\bot}$ becomes sufficiently large. Our results provide a microscopic origin of the diagonal spin stripes and identify Hund's coupling $J_H$ and interlayer coupling $J_{\bot}$ as key ingredients governing magnetic order and pairing tendencies in La$_3$Ni$_2$O$_7$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_25344 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Origin of Spin Stripes in Bilayer Nickelate La$_3$Ni$_2$O$_7$ Wang, Hao-Xin Oh, Hanbit Helbig, Tobias Wang, Bai Yang Li, Jiarui Yu, Yijun Hwang, Harold Y. Jiang, Hong-Chen Wu, Yi-Ming Raghu, S. Superconductivity Strongly Correlated Electrons The bilayer nickelate La$_3$Ni$_2$O$_7$ has recently emerged as a high-temperature superconductor with unusual spin stripe order in its ambient pressure phase. We propose a microscopic Hamiltonian that faithfully reflects the crystalline symmetry of this system, with the primary aim of addressing its unconventional magnetism at ambient pressure. Using state-of-the-art density matrix renormalization group calculations, we show that $(π/2,π/2)$ spin stripe order arises in our model at sizable Hund's coupling $J_H$ from a hidden quasi-one-dimensionality and persists over a range of electron concentrations. In the more symmetric high-pressure regime, our model exhibits enhanced interlayer pairing tendencies when the interlayer antiferromagnetic coupling $J_{\bot}$ becomes sufficiently large. Our results provide a microscopic origin of the diagonal spin stripes and identify Hund's coupling $J_H$ and interlayer coupling $J_{\bot}$ as key ingredients governing magnetic order and pairing tendencies in La$_3$Ni$_2$O$_7$. |
| title | Origin of Spin Stripes in Bilayer Nickelate La$_3$Ni$_2$O$_7$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.25344 |